package com.itheima.reggie.filter;

import java.lang.String;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author li
 * 配置拦截器，检查用户是否登录，若没有登录则不能访问后台管理的页面
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求的url
        String requestURI = request.getRequestURI();

        log.info("拦截到请求:{}",requestURI);

        //定义不需要处理的请求路径(用字符串数组存)
        String[] urls = new java.lang.String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4-1.判断后台管理人员登录状态，如已经登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，id为：{}",request.getSession().getAttribute("employee"));

            //获取线程id
//            long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }
        //4-2.判断用户登录状态，如已经登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，id为：{}",request.getSession().getAttribute("user"));

            //获取线程id
//            long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }


        log.info("用户未登录");
        //5.如果未登录则返回未登陆结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
